Definition: You are given a math word problem and you are supposed to make use of mathematical concepts like probability, combinatorics, linear equations, sequences/series, or simple operators like addition, subtraction, division, or multiplication to answer the given question. Choose the best option from the 5 given options and report that option.
Input: Question: What is the units digit of the expression 14^7−17^4?

 Option A:  0

 Option B:  3

 Option C:  4

 Option D:  8

 Option E:  6

Option D